:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --card: #f9fafb;
  --accent: #4f46e5;
  --accent-2: #06b6d4;
  --tag-bg: #eef2ff;
  --tag-fg: #3730a3;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1117;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --line: #262a35;
    --card: #161a23;
    --accent: #818cf8;
    --accent-2: #22d3ee;
    --tag-bg: #1e2140;
    --tag-fg: #c7d2fe;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1117;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --line: #262a35;
  --card: #161a23;
  --accent: #818cf8;
  --accent-2: #22d3ee;
  --tag-bg: #1e2140;
  --tag-fg: #c7d2fe;
}


* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  word-break: keep-all;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800; }
h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.25rem; }
h3 { font-size: 1.1rem; font-weight: 700; }
p { margin: 0 0 .75rem; }

.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

.site-header { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 1rem; }
.brand { font-weight: 800; color: var(--fg); }
.nav nav { display: flex; gap: 1.1rem; flex-wrap: wrap; font-size: .95rem; }
.nav nav a { color: var(--muted); }
.nav nav a:hover { color: var(--fg); text-decoration: none; }

.hero { padding: 4.5rem 0 3rem; }
.hero-sub { color: var(--muted); }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .85rem; letter-spacing: .04em; text-transform: uppercase; margin-bottom: .5rem; }
.lead { font-size: 1.15rem; color: var(--fg); max-width: 60ch; }

.section { padding: 2.5rem 0; border-top: 1px solid var(--line); }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }
.box { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem; }

.tag { display: inline-block; background: var(--tag-bg); color: var(--tag-fg); border-radius: 999px; padding: .15rem .65rem; font-size: .8rem; font-weight: 600; margin: 0 .35rem .35rem 0; }
.skills div { display: grid; grid-template-columns: 160px 1fr; gap: .5rem 1rem; padding: .6rem 0; border-bottom: 1px dashed var(--line); }
.skills dt { font-weight: 700; color: var(--muted); }
.skills dd { margin: 0; }
@media (max-width: 560px) { .skills div { grid-template-columns: 1fr; } }

.card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; color: var(--fg); transition: transform .15s, box-shadow .15s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,0,0,.08); text-decoration: none; }
.card-img { aspect-ratio: 16 / 10; overflow: hidden; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.card-img img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.card-body { padding: 1.1rem 1.25rem 1.25rem; }
.card-body h3 { margin-top: .2rem; }
.card-body p { color: var(--muted); font-size: .95rem; }
.card-body .tags { margin-top: .5rem; }

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: grid; grid-template-columns: 170px 1fr; gap: 1rem; padding: .9rem 0; border-bottom: 1px dashed var(--line); }
.timeline .when, .plain .when { color: var(--muted); font-variant-numeric: tabular-nums; font-size: .95rem; }
.timeline p { color: var(--muted); font-size: .95rem; margin: 0; }
@media (max-width: 560px) { .timeline li { grid-template-columns: 1fr; gap: .2rem; } }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { padding: .5rem 0; border-bottom: 1px dashed var(--line); }
.plain .when { display: inline-block; min-width: 110px; }

.links { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }
.btn { display: inline-block; border: 1px solid var(--line); background: var(--card); color: var(--fg); padding: .5rem 1rem; border-radius: 10px; font-weight: 600; font-size: .95rem; }
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

.project-page { padding: 2.5rem 0 4rem; max-width: 820px; }
.back { display: inline-block; color: var(--muted); margin-bottom: 1.5rem; }
.project-head .meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 1.5rem 0 0; padding: 1.25rem; background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.meta dt { font-size: .8rem; color: var(--muted); font-weight: 600; margin-bottom: .2rem; }
.meta dd { margin: 0; }
.hero-img { margin: 2rem 0; }
.hero-img img { max-height: 520px; margin: 0 auto; border-radius: 14px; border: 1px solid var(--line); }
.prose h2 { font-size: 1.3rem; margin-top: 2.25rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.prose blockquote { margin: 1rem 0; padding: .75rem 1rem; border-left: 4px solid var(--accent); background: var(--card); border-radius: 0 10px 10px 0; color: var(--muted); }
.prose ul { padding-left: 1.2rem; }

.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--muted); font-size: .9rem; margin-top: 2rem; }

/* ---------- 페이지 분리 구조 ---------- */
.brand { display: inline-flex; align-items: center; gap: .55rem; }
.logo { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; font-weight: 800; font-size: 1.05rem; }
.brand-name { font-weight: 800; letter-spacing: .03em; color: var(--accent); }

.menu { display: flex; align-items: center; gap: 1.1rem; }
.menu-group { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.menu a { color: var(--fg); font-weight: 500; font-size: .98rem; padding: .25rem 0; border-bottom: 2px solid transparent; }
.menu a:hover { color: var(--accent); text-decoration: none; }
.menu a.on { color: var(--accent); border-bottom-color: var(--accent); }
.menu-divider { width: 1px; height: 22px; background: var(--line); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; color: var(--fg); font-size: 1.1rem; padding: .25rem .6rem; }
@media (max-width: 860px) {
  .nav { flex-wrap: wrap; height: auto; padding: .75rem 0; }
  .nav-toggle { display: inline-block; margin-left: auto; }
  .menu { display: none; width: 100%; flex-direction: column; align-items: flex-start; gap: .5rem; padding-top: .75rem; }
  body.nav-open .menu { display: flex; }
  .menu-divider { width: 100%; height: 1px; }
}

.page-head { text-align: center; padding: 4rem 0 2.5rem; }
.page-head h1 { font-size: clamp(2rem, 4vw, 2.6rem); }
.page-head .subtitle { color: var(--muted); font-size: 1.05rem; }
.page-body { padding-bottom: 4rem; }
.page-body h2 { margin-top: .5rem; }
.page-body h2.mt { margin-top: 3rem; }
.mt { margin-top: 3rem; }
.muted { color: var(--muted); }
.org { color: var(--muted); font-size: .92rem; margin: 0 0 .25rem; }
.more { margin-top: 1.25rem; font-weight: 600; }
.tag.lg { font-size: .95rem; padding: .35rem .9rem; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { opacity: .9; color: #fff; }

.card-img { position: relative; }
.badge { position: absolute; top: .8rem; left: .8rem; background: color-mix(in srgb, var(--bg) 92%, transparent); color: var(--accent); font-weight: 700; font-size: .8rem; padding: .3rem .7rem; border-radius: 999px; border: 1px solid var(--line); }
.card-body .tags { margin: 0 0 .5rem; }



/* ---------- 프로젝트 사진 · 그래프 ---------- */
.prose figure.chart { margin: 1.25rem 0; }
.prose figure.chart img { border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.prose figure.chart figcaption, .photo-grid figcaption { font-size: .88rem; color: var(--muted); margin-top: .4rem; }
.chart-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.chart-row figure.chart { margin: .5rem 0; }
.photos { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.photos h2 { font-size: 1.3rem; }
.photo-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.photo-grid figure { margin: 0; }
.photo-grid img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 12px; border: 1px solid var(--line); }

/* ---------- 앱 화면 스크린샷 ---------- */
.screens { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 1rem; margin: 1rem 0 .5rem; }
.screens figure { margin: 0; }
.screens img { width: 100%; aspect-ratio: 9 / 20; object-fit: cover; border-radius: 16px; border: 1px solid var(--line); background: #fff; }
.screens figcaption { font-size: .82rem; color: var(--muted); margin-top: .45rem; line-height: 1.45; }
.small { font-size: .85rem; }

/* 수상 카드: 상패가 다 보이도록 세로 여유 + 중앙 정렬 */
.award-card .card-img { aspect-ratio: 4 / 3; }
.award-card .card-img img { object-position: center; }

/* 경험 타임라인 유형 태그 */
.type-tag { display: inline-block; vertical-align: middle; margin-right: .5rem; padding: .12rem .55rem; border-radius: 999px; background: var(--tag-bg); color: var(--tag-fg); font-size: .75rem; font-weight: 700; }

/* About Me 상단 연락처 버튼 */
.contact-row { margin: -2.75rem 0 2rem; }
.btn.sm { padding: .38rem .85rem; font-size: .88rem; border-radius: 999px; }

/* 연락처 버튼 색상 */
.btn.c-mail { background: #ea4335; border-color: #ea4335; color: #fff; }
.btn.c-github { background: #181717; border-color: #181717; color: #fff; }
.btn.c-linkedin { background: #0a66c2; border-color: #0a66c2; color: #fff; }
.btn.c-mail:hover, .btn.c-github:hover, .btn.c-linkedin:hover { opacity: .88; color: #fff; text-decoration: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn.c-github { background: #2d333b; border-color: #2d333b; } }
:root[data-theme="dark"] .btn.c-github { background: #2d333b; border-color: #2d333b; }

/* ---------- 테마 토글 ---------- */
.theme-toggle { margin-left: .6rem; width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer; display: inline-grid; place-items: center; font-size: 1rem; line-height: 1; transition: transform .2s, background .2s; }
.theme-toggle:hover { transform: rotate(20deg); border-color: var(--accent); }
.theme-toggle .sun, .theme-toggle .moon { display: none; }
html[data-theme="dark"] .theme-toggle .sun { display: block; }
html[data-theme="light"] .theme-toggle .moon { display: block; }
html:not([data-theme]) .theme-toggle .moon { display: block; }
@media (prefers-color-scheme: dark) { html:not([data-theme]) .theme-toggle .moon { display: none; } html:not([data-theme]) .theme-toggle .sun { display: block; } }
@media (max-width: 860px) { .theme-toggle { margin-left: 0; } }

/* ---------- 스크롤 등장 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal-stagger > * { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal-stagger.in > * { opacity: 1; transform: none; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: .08s; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: .16s; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: .24s; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: .32s; }
.reveal-stagger.in > *:nth-child(n+6) { transition-delay: .4s; }
@media (prefers-reduced-motion: reduce) { .reveal, .reveal-stagger > * { opacity: 1; transform: none; transition: none; } }

/* ---------- 핵심 지표 ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin: 2.5rem 0 0; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.1rem 1.2rem; }
.stat .num { font-size: 2rem; font-weight: 800; letter-spacing: -0.02em; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1.1; }
.stat .num small { font-size: 1rem; font-weight: 700; margin-left: .1rem; }
.stat .label { color: var(--muted); font-size: .88rem; margin-top: .35rem; line-height: 1.4; }